Dynamo-electric machine.



E. P. W. ALEXANDER SON. DYNAMO ELEGTRIG MACHINE.

APPLICATION TILED 00114. 1907.

Patented Feb. 15, 1910.-

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Q swm Inventor: Ernst F. W. filexan erson,

Witnesses following is a specification.

' for high speed operation the induoed voltage between the terminalsofza single coi1,' even STATES P TENT; (m

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- sp cific tion a: Letters Patent.

To all whom-it ma-y concem:

. I Be it known that I, ERNST F. \V. ALnx-' .\..\m:nso.\' a citizenof-the United Statesgresiding at Schenectady, county of Schenectady, State of-Ne\v;York,- tain new and useful Improvements in. Dynamo-Electric 'Mach ines,- of; which the 'My-inventionfrelates to d namo-electric machines of the commutator ype, a ndpar-- ticularly to large high-speed machines.

.In large direct current generators designed;

it the coilhas onl-ylasin le turn, may be too high to impress on a jacent icommutatorj segments if ood{='commutation is when) tamed. It; iasgi therefore, been proposed heretofore;- to. provide twice as many se e ments *as j armature-"coils; to connect on y alternate segments to the armature winding inthe usual way; and to connect the remain? ing segments tot-he opposite ends of; the code by conductors running through or under the armature core. By means of this arrangement .the voltage between adjacent commutator segments is reduced to'one-half that of a single turn of the armature winding, but commutation;dirliculties are introduced by the factthat the current isshifted alternately from one end to the otherof the arn'iature coils, and that the leads which carry the current to the-back end of the armature possesses very highself' induction, because of their location in or under the armature core. Thu self induction gives rise to high reactive voltages which inter fere with proper commutation. Theob ect of'my invention is to reduce the voltage between adjacent segments to a fraction of that ofa single armature turn without introducing any self-induction that can have a detrimental effect on commutahave invented cer- 1 My 1nv en'ti0n will best-be .understood by.

to the accompany ng drawings. in

tion.

My invention consists in providin aplurality of armature windings eonnecte to a successive commutator segments, and connectionsfrom' each end of each coil of each 3 other winding; These connections may he "inding to the opposite end of a coil of ant I placed in or beneath the armature core withl outintroducing any detrimental self induction. because as the current varies in'one of theseconnections, an equal and opposite variation occurs in an adjacent connection, a

. one conductor (Z decreases so that equal and in adjacent I Application li1ed 0ctoher 14,1907:. scram... 397,213.;

which neutralizes current varlationinthe first'coiniection. Y My invention further COIDPIISQS- ('tf-ll;tlll;

structural features which .will hehereiimfter pointed out.

reference Figure lishows a diagrammatical (l velop ment on a plane surface .of the arnniture ranged in accordance with m n -invention:

Fig. 2 shows across-se'cti onal .sidereleyatioo offthe armature; and F 1g ..3 sh

YORK, AssIGNon 'ro' GENERAL Patented Feb. 15,1910.

the

-wind-ing and 'connectipns of a machinear Fig. 2, the line'2-2 of Fig, 3 beiug t-haton which the cross-section of. Fig. Q-is taken,

. --.Referring firs t to Fig. 1," attend a repreairof armature w1ndmgs,icach of,

For-- sent a. the-wel -known:multi le,,or; lap ty e. the sakegofpclearness t es'etwo windings are indicated by,lines of different thickness.

The two windings a by commutator "leads c conductors d are shown in dotted lines to indicate that they may extend through or under the armature core. Current entering the brush B passes from each; segment on which the brush bearsboth to the front, of a coil of one winding and through a conductor d to the back end of an adjacent coil of the other winding. As the commutator passes under the brush the current passing from the brush -to'one segment decreases, while the current passing to the adjacent segment increases. This means that ,as the current in as the segment to which it is connected leaves the brush. the currentin the adjacent conductor (Z increases, opposite variations occur conductors (I. which produce a mutual neutralization ofinductive effects The preferred construction of the maclune is shown in Figs. 9. and The con ctois (I are carried in slots in a sleeve I), which represents a commutator brush bearing on this commutator;v

It will be noted that lOO main commutator G in order thatj the coil connections to the conductors d ma be made by means of commutator leadsfc standard tential segments of the two commutators;- these segments being connected .to coils ofconstructiom, .The leads (2 connect equipodifierentwindin'gs'," f .7 represent the hind.-

ing rings ordinarily employed in; high speed commutator construction. I

Idonot desire to'limit myselfto the par:

' ticular, construction and arrangement of parts here shown, butaim 1n the a V claims-to cover all modifications w ich are within the scope' of my invention.

- What 'I' claim as new and desire to secure by Letters Patent of the United States, is,-'-

1.- In a dynamo-electric machine, an ar-' mature having a plurality of armature windings' connecte to sucoess'ivecomm'utator seg ments, and connections from each end of each coil of each' winding to the opposite en nected toalternate commutator segments,

and connections from-each end of each coil to the opposite end of an 1 adjacent coil 0 the other winding.

' of each windin of a coil ofanother winding. v

t 2. Inga";dynamo-electric machine, an armature having two armature windings cone 3." In a dynamo-electric machine, an ar- -mature having a plurality of armature windingsgeach extending around the armature, sald windings being connected to successive commutator segments, and conductors correspondmg n number to the (10118 of said pended windings and extendin through the armature and each connected at its opposite ends to coils of dilferent'windings. w I

451113 dynamo electric machine, an armature c0re,- a main commutator on one side of said core, an auxiliary commutator on the other side oflsaid cofe', a plurality of'armaected to successive segture windin co ments of hot commutators, and connections between equipoteutial. segments of the two commutators, said e uipotential segments being connected to co ls of'ldifierent wind-* ings.

ture coresurrounding saidsleeve, a plurality windings. r

1 of armature windings carried slots'in said core, and conductors carried 1n the slots 1n said sleeve each in electrical connection at its opposite ends with coils; of different 6. In a dynamolectric machine, a shaft,

a slotted sleeve thereon, a laminated-arma- .ture core surrounding saidsleeve, main and auxiliary-commutators on opposite sides "of saidcore, 'a plurality -offarmatu're '\.vindi'ngscarried in slots in said-coreaand connected.to

successive segments of both: 'commutators, and conductors carr ed'm the slots in said sleeve connecting equipotential segments of the two commutators,said equipotentialseg- .ments being connected'to 60113 of different windings.

- Inwitness whereof, I' have,hereunto" set my'hand'this 11th day ofOctober, 1907: 1

lVitnesses HELEN Onroxn, MARGARET E. lVooLLnY.

nimsr r; w. ltnxlunnasouj 5'. In a dynaind-electric machine," a shaft, a slotted sleeve thereon,.a' laminated a rma-.. 

